diff --git a/pkgs/applications/science/math/sage/dist-tests.nix b/pkgs/applications/science/math/sage/dist-tests.nix
index 24a86a8f37a4..45376b832b9f 100644
--- a/pkgs/applications/science/math/sage/dist-tests.nix
+++ b/pkgs/applications/science/math/sage/dist-tests.nix
@@ -7,10 +7,10 @@
 # subset of files responsible for the vast majority of packaging tests, we can
 # think about moving this upstream.
 [
-	"src/sage/env.py" # [1]
-	"src/sage/misc/persist.pyx" # [1]
-	"src/sage/misc/inline_fortran.py" # [1]
-	"src/sage/repl/ipython_extension.py" # [1]
+  "src/sage/env.py" # [1]
+  "src/sage/misc/persist.pyx" # [1]
+  "src/sage/misc/inline_fortran.py" # [1]
+  "src/sage/repl/ipython_extension.py" # [1]
 ]
 
 # Numbered list of past failures to annotate files with
diff --git a/pkgs/build-support/dotnet/dotnetenv/build-solution.nix b/pkgs/build-support/dotnet/dotnetenv/build-solution.nix
index b3372b942177..9984db1cb2d3 100644
--- a/pkgs/build-support/dotnet/dotnetenv/build-solution.nix
+++ b/pkgs/build-support/dotnet/dotnetenv/build-solution.nix
@@ -31,41 +31,37 @@ stdenv.mkDerivation {
   '';
 
   installPhase = ''
-    addDeps()
-    {
-	if [ -f $1/nix-support/dotnet-assemblies ]
-	then
-	    for i in $(cat $1/nix-support/dotnet-assemblies)
-	    do
-		windowsPath=$(cygpath --windows $i)
-		assemblySearchPaths="$assemblySearchPaths;$windowsPath"
+    runHook preInstall
 
-		addDeps $i
-	    done
-	fi
+    addDeps() {
+      if [ -f $1/nix-support/dotnet-assemblies ]; then
+        for i in $(cat $1/nix-support/dotnet-assemblies); do
+          windowsPath=$(cygpath --windows $i)
+          assemblySearchPaths="$assemblySearchPaths;$windowsPath"
+
+          addDeps $i
+        done
+      fi
     }
 
-    for i in ${toString assemblyInputs}
-    do
-	windowsPath=$(cygpath --windows $i)
-	echo "Using assembly path: $windowsPath"
+    for i in ${toString assemblyInputs}; do
+      windowsPath=$(cygpath --windows $i)
+      echo "Using assembly path: $windowsPath"
 
-	if [ "$assemblySearchPaths" = "" ]
-	then
-	    assemblySearchPaths="$windowsPath"
-	else
-	    assemblySearchPaths="$assemblySearchPaths;$windowsPath"
-	fi
+      if [ "$assemblySearchPaths" = "" ]; then
+        assemblySearchPaths="$windowsPath"
+      else
+        assemblySearchPaths="$assemblySearchPaths;$windowsPath"
+      fi
 
-	addDeps $i
+      addDeps $i
     done
 
     echo "Assembly search paths are: $assemblySearchPaths"
 
-    if [ "$assemblySearchPaths" != "" ]
-    then
-	echo "Using assembly search paths args: $assemblySearchPathsArg"
-	export AssemblySearchPaths=$assemblySearchPaths
+    if [ "$assemblySearchPaths" != "" ]; then
+      echo "Using assembly search paths args: $assemblySearchPathsArg"
+      export AssemblySearchPaths=$assemblySearchPaths
     fi
 
     mkdir -p $out
@@ -77,9 +73,10 @@ stdenv.mkDerivation {
 
     mkdir -p $out/nix-support
 
-    for i in ${toString assemblyInputs}
-    do
-        echo $i >> $out/nix-support/dotnet-assemblies
+    for i in ${toString assemblyInputs}; do
+      echo $i >> $out/nix-support/dotnet-assemblies
     done
+
+    runHook postInstall
   '';
 }
diff --git a/pkgs/build-support/dotnet/dotnetenv/wrapper.nix b/pkgs/build-support/dotnet/dotnetenv/wrapper.nix
index 423303c3084a..549abd07e2b9 100644
--- a/pkgs/build-support/dotnet/dotnetenv/wrapper.nix
+++ b/pkgs/build-support/dotnet/dotnetenv/wrapper.nix
@@ -28,27 +28,23 @@ dotnetenv.buildSolution {
   slnFile = "Wrapper.sln";
   assemblyInputs = [ application ];
   preBuild = ''
-    addRuntimeDeps()
-    {
-	if [ -f $1/nix-support/dotnet-assemblies ]
-	then
-	    for i in $(cat $1/nix-support/dotnet-assemblies)
-	    do
-		windowsPath=$(cygpath --windows $i | sed 's|\\|\\\\|g')
-		assemblySearchArray="$assemblySearchArray @\"$windowsPath\""
+    addRuntimeDeps() {
+      if [ -f $1/nix-support/dotnet-assemblies ]; then
+        for i in $(cat $1/nix-support/dotnet-assemblies); do
+          windowsPath=$(cygpath --windows $i | sed 's|\\|\\\\|g')
+          assemblySearchArray="$assemblySearchArray @\"$windowsPath\""
 
-		addRuntimeDeps $i
-	    done
-	fi
+          addRuntimeDeps $i
+        done
+      fi
     }
 
     export exePath=$(cygpath --windows $(find ${application} -name \*.exe) | sed 's|\\|\\\\|g')
 
     # Generate assemblySearchPaths string array contents
-    for path in ${toString assemblyInputs}
-    do
-        assemblySearchArray="$assemblySearchArray @\"$(cygpath --windows $path | sed 's|\\|\\\\|g')\", "
-	addRuntimeDeps $path
+    for path in ${toString assemblyInputs}; do
+      assemblySearchArray="$assemblySearchArray @\"$(cygpath --windows $path | sed 's|\\|\\\\|g')\", "
+      addRuntimeDeps $path
     done
 
     sed -e "s|@ROOTNAMESPACE@|${namespace}Wrapper|" \
@@ -57,8 +53,8 @@ dotnetenv.buildSolution {
 
     sed -e "s|@NAMESPACE@|${namespace}|g" \
         -e "s|@MAINCLASSNAME@|${mainClassName}|g" \
-	-e "s|@EXEPATH@|$exePath|g" \
-	-e "s|@ASSEMBLYSEARCHPATH@|$assemblySearchArray|" \
+        -e "s|@EXEPATH@|$exePath|g" \
+        -e "s|@ASSEMBLYSEARCHPATH@|$assemblySearchArray|" \
         Wrapper/Wrapper.cs.in > Wrapper/Wrapper.cs
   '';
 }
diff --git a/pkgs/build-support/rust/build-rust-crate/log.nix b/pkgs/build-support/rust/build-rust-crate/log.nix
index 9054815f4a1b..cb0846190eac 100644
--- a/pkgs/build-support/rust/build-rust-crate/log.nix
+++ b/pkgs/build-support/rust/build-rust-crate/log.nix
@@ -49,11 +49,11 @@ in {
 
   noisily = colors: verbose: ''
     noisily() {
-  	  ${lib.optionalString verbose ''
+      ${lib.optionalString verbose ''
         echo_colored -n "Running "
         echo $@
-  	  ''}
-  	  $@
+      ''}
+      $@
     }
   '';
 }
diff --git a/pkgs/by-name/lz/lzlib/package.nix b/pkgs/by-name/lz/lzlib/package.nix
index db517669c5e8..6e9510215abe 100644
--- a/pkgs/by-name/lz/lzlib/package.nix
+++ b/pkgs/by-name/lz/lzlib/package.nix
@@ -30,4 +30,4 @@ stdenv.mkDerivation (finalAttrs: {
     platforms = lib.platforms.all;
     maintainers = with lib.maintainers; [ ehmry ];
   };
-})
\ No newline at end of file
+})
diff --git a/pkgs/data/icons/apple-cursor/default.nix b/pkgs/data/icons/apple-cursor/default.nix
index 6f33219ed6c5..e2f059ecb1fb 100644
--- a/pkgs/data/icons/apple-cursor/default.nix
+++ b/pkgs/data/icons/apple-cursor/default.nix
@@ -31,7 +31,6 @@ in stdenv.mkDerivation rec {
     homepage = "https://github.com/ful1e5/apple_cursor";
     license = [
       licenses.gpl3Only
-    
       # Potentially a derivative work of copyrighted Apple designs
       licenses.unfree
     ];